ahh, i kind of suck at this so bear with me. liam is from a new money/social-climbing family in new york city. liam's parents were pretty absent in his life due to his father working his way up to his current cozy gig as a us representative. as one might expect, liam acted out and barely had much of a childhood since he had to look out for himself. at times he was shipped off to boarding school so not to draw attention to his family, and by the time college came around, he was ready for a big change of scenery. liam went to ut austin to somewhat placate his father who is also an alum, and because he has family here.
if you're set on a last name for him, we can say their mothers are sisters?